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Magnetic behavior of bulk and fine particles of RCr 2 Si 2 C (R = La, Ce) compounds: possible magnetic ordering from Cr

Mukherjee, K and Iyer, Kartik K and Sampathkumaran, E V (2010) Magnetic behavior of bulk and fine particles of RCr 2 Si 2 C (R = La, Ce) compounds: possible magnetic ordering from Cr. Journal of Physics: Condensed Matter, 22 (29). p. 295603.

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Official URL: http://stacks.iop.org/0953-8984/22/i=29/a=295603

Abstract

The magnetic behavior of the quaternary compounds, RCr 2 Si 2 C (R = La, Ce), has been investigated by magnetization ( M ) and heat-capacity ( C ) measurements (1.8–300 K) in the bulk polycrystals and nano forms (<1 µm) obtained by high-energy balling. Our finding is that Cr appears to exhibit magnetic ordering of an itinerant type at low temperatures (<20 K) in the bulk form, as inferred from a combined look at all the data. The magnetic ordering gets gradually suppressed with increasing milling time. Evidence for a mixed-valence state of Ce for the bulk form is obtained from the tendency of magnetic susceptibility to exhibit a maximum above 300 K. However, this feature vanishes in the nano form, which exhibits a Curie–Weiss behavior above 200 K as though Ce tends towards trivalency in these fine particles; in addition, there is a weak upturn in C / T below 10 K in the bulk, which becomes very prominent in the milled Ce-based specimens at lower temperatures, as though heavy-fermion behavior gets stronger in smaller particles.

Item Type:Article
ID Code:11215
Deposited By:Prof. Alexey Ivanov
Deposited On:01 Nov 2011 23:29
Last Modified:02 Nov 2011 00:47

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